Plan B: Brand name for a progestin-only emergency contraceptive designed to prevent pregnancy within 72 hours after a contraceptive accident or unprotected sex. However, early treatment is significantly more effective. Each 12 hours of delay in the start of treatment after intercourse generally reduces efficacy by 50%. Levonorgestrel, the active ingredient, is believed to act principally by interfering with the process of ovulation. It may also interfere with fertilization or implantation. It is not effective once implantation has begun. It is not an abortifacient. Common side effects include nausea, abdominal pain, fatigue, headache, and menstrual changes.
About a progestin-only emergency contraceptive available in the U.S. ("If Plan A fails, go to Plan B...")
Plan B One-Step™ is the only one-pill emergency contraceptive available over-the-counter. It is a backup method of preventing pregnancy—and is not for routine use.
I've carried a smartphone of some sort for nearly 7 years now without ever losing one or having one of those close calls that scare you into thinking carefully about ...
Plan B (levonorgestrel) is used to prevent pregnancy after unprotected sex or failure of other forms of birth control. Includes Plan B side effects, interactions and ...